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Section 5 <br />drinking water suppliers. California State Water Resources Control Board <br />Division of Drinking Water recommends that suppiliers, inform their customers <br />about the presence of the constituent, and about associated health concerns. <br />Additionally, suppliers are recommended to remove the source from service <br />when a contaminant significantly exceeds Notification Level concentrations. This <br />specific recommendation depends on the toxicological endpoint (i.e., cancer risk <br />or non-cancer effects) that provides the basis for the Notification Level, <br />State of California Porter Cologne Water Quality Control Act <br />The Porter Cologne Water Quality Act of 1967 requires the SWRCB and the nine <br />RWQCBs to adopt water quality criteria for the protection and enhancement of <br />Waters of the State of California, including both surface waters and groundwater. <br />The SWRCB sets statewide policy and together with the RWQCB, implements <br />State and Federal water quality laws and regulations. Each of the nine regional <br />boards adopts a Water Quality Control Plan or Basin Plan. The project area is <br />included within the Santa Ana River Basin Plan. As shown in Table 28 the Basin <br />Plan divides the Santa Ana River into 6 reaches. Centennial Park and Heritage <br />Museum are both adjacent to Reach 1 of the Santa Ana River, <br />Table 28: Reaches of the Santa Ana River <br />Reach <br />Reach 1 <br />Location <br />Tidal Prism to 17" Street <br />Reach 2 <br />17" Street to Prado Dam <br />Reach 3 <br />Prado Dam to Mission Boulevard <br />Reach 4 <br />Mission Boulevard to San Jacinto Fault <br />Reach 5 <br />Sari Jacinto Fault to Seven Oaks Dam <br />Reach 6 <br />Seven Oaks Darn to Headwaters <br />Santa Ana River Basin Plan <br />Beneficial Uses <br />The Santa Ana River Basin (Basin Plan) designates beneficial uses for waters in <br />the Santa Ana River Watershed and provides quantitative and narrative criteria <br />for a range of water quality constituents applicable to certain receiving water <br />bodies in order to protect these beneficial uses. Specific criteria are provided for <br />the larger water bodies within the region as well as general criteria or guidelines <br />for ocean waters, bays and estuaries, inland surface waters, and groundwater <br />basins, The beneficial uses in the Basin Plan are described in Table 29. <br />IQ Mid Basin Centennial Park �je&2kbProject Final FIR 5-104 <br />